Quick answer: A non-capital loss is the business loss a corporation (or an individual) has when deductible expenses exceed income for the year. It is not wasted. It can be carried back up to 3 tax years to recover tax already paid, or carried forward up to 20 years (for losses arising in tax years ending after 2005) against future income. A corporation tracks and applies it on Schedule 4 of the T2. Because the small business deduction is calculated on taxable income after the loss, applying a loss also changes how much income gets the 9% rate.
Key takeaways
- Non-capital losses carry back 3 years and forward 20 years (for losses arising after 2005).
- A carry-back is a refund of tax already paid; a carry-forward is tax not paid later. Cash now usually wins, but not always.
- A corporation requests a carry-back and tracks the balance on Schedule 4; the amounts applied go on lines 331 and 332 of the T2.
- The amount applied is a choice each year; you need not use the whole loss at once.
- The small business deduction is the least of active business income, taxable income and the business limit, so a loss applied reduces the income taxed at 9%.
- Losses can be lost: an acquisition of control restricts them, and losses older than 20 years expire.
On this page
What a non-capital loss is
A corporation’s income for tax is its revenue less its deductible expenses, after adjustments such as the 50% on meals and CCA in place of depreciation. When that figure is negative, the negative amount is a non-capital loss. It covers losses from a business or property, and it is distinct from a capital loss, which arises on selling capital property and can only offset capital gains. An allowable business investment loss is a special case that can offset any income. A terminal loss on selling depreciable property is not a separate category; it is a deduction that goes into the same calculation and can create or increase a non-capital loss. The terminal loss guide explains that case.
The loss is calculated per tax year. A corporation with a $40,000 loss in year one and a $90,000 profit in year two does not pay tax on $50,000 automatically; it pays tax on $90,000 unless it applies the year-one loss against it, which is a step on the return, not a default.
The two directions: 3 years back, 20 years forward
| Carry-back | Carry-forward | |
|---|---|---|
| Period | The 3 tax years before the loss year | The 20 tax years after the loss year (losses arising in tax years ending after 2005) |
| Effect | Reduces taxable income of an earlier year; the CRA reassesses and refunds the tax paid | Reduces taxable income of a later year; less tax is paid then |
| How it is requested | Schedule 4, Part 1, on the loss year’s return (or an amended request) | Line 331 of the T2 in the year the loss is deducted |
| Timing of the benefit | Cash within months of filing | Only when and if the corporation earns taxable income |
| Risk | None, once the earlier year is reassessed | Expires after 20 years; restricted on an acquisition of control |
Losses from tax years ending in 2004 and 2005 had a 10-year carry-forward, and earlier losses 7 years; those periods have run out, so for any loss a business is likely to hold today, the carry-forward is 20 years.
How to apply it on the T2
The work is on Schedule 4, Corporation Loss Continuity and Application. Part 1 deals with non-capital losses: the balance brought forward, the loss for the current year, any amount applied in the current year, any amount the corporation asks to carry back to each of the three prior years, and the balance carried forward. The amount deducted in the current year goes to line 331 of the T2; a carry-back request is made on the same schedule and the CRA reassesses the earlier years.
Two features are worth knowing. The amount applied is a choice: a corporation may deduct part of a loss and carry the rest, which lets it keep enough taxable income in a year to use non-refundable credits or stay within a target. And the continuity has to be kept year after year, even in years when nothing is applied, because the CRA’s record of the balance comes from the schedule. A corporation that stops filing Schedule 4 in a nil year tends to find its loss balance disputed a decade later. The nil-year point is covered in T2 nil returns for an inactive corporation, and the mechanics of the return in how to file a T2.
The interaction with the small business deduction
The small business deduction is calculated on the least of three amounts: the corporation’s active business income carried on in Canada, its taxable income, and its business limit. Taxable income is net income after the deductions on the third page of the return, which include non-capital losses from other years. The result after the deduction is the 9% federal rate on that amount, before provincial tax.
So applying a loss reduces taxable income, and because taxable income is one of the three limbs, it reduces the amount that qualifies for the small business rate. That is the intended effect: the loss shelters income that would otherwise have been taxed at 9%. It becomes a planning point where income is above the business limit. A corporation with $600,000 of active business income and $100,000 of losses could apply the loss against the income taxed at the general rate rather than the 9% rate, since the loss reduces taxable income from the top. Applying a loss in a year when all income was already within the small business limit saves tax at 9%; holding it for a year when income exceeds the limit saves tax at the general rate. The business limit itself can be reduced by passive income or by association with other corporations, explained in the passive income rule and associated corporations and the SBD.
Carry back or carry forward: how to choose
The default is to carry back, because a refund now is worth more than a deduction later and carries no risk of expiry. The exceptions are specific.
- The earlier years were taxed at a low rate (all income within the small business limit) and the next years will exceed the limit. Carrying forward saves tax at the higher general rate.
- The earlier years used credits that a reduced taxable income would waste.
- A change of control is coming. After an acquisition of control, non-capital losses from before the change can only be used against income from the same or a similar business carried on with a reasonable expectation of profit. A carry-back before the change secures the value; a sale of the corporation to a buyer who wants the losses is restricted. This is one reason a buyer often prefers an asset purchase, covered in share sale versus asset sale.
- The corporation is being wound up. A loss that will never meet future income should be carried back while the three-year window is open; the sequence is in dissolving a corporation.
A worked example
A consulting corporation with a 31 December year-end earned taxable income of $80,000 in 2024 and $120,000 in 2025, all within the small business limit, and paid tax on each. In 2026 it lost a major client and finished with a non-capital loss of $60,000. For 2027 it expects $150,000.
Carry back. On the 2026 return, Schedule 4 requests $60,000 against 2025. The CRA reassesses 2025 on $60,000 of taxable income instead of $120,000 and refunds the tax paid on the difference, at the rate that applied in 2025. Cash arrives in 2027.
Carry forward. The 2026 loss sits on Schedule 4. On the 2027 return, $60,000 goes on line 331 and taxable income falls from $150,000 to $90,000. Tax saved at the 2027 rate on $60,000, realised when the 2027 return is filed in 2028.
Since both years are within the small business limit, the rate is the same in each direction and the carry-back wins on timing. If the 2027 income were expected at $700,000, part of the loss would be saving tax at the general rate if carried forward, and the comparison has to be run with the actual provincial rates. Keep a short note of why the choice was made; the question comes back in a review.
Losses for an unincorporated business
A sole proprietor’s business loss first offsets other income on the same T1 (employment, investment). What is left is a non-capital loss with the same 3-year carry-back and 20-year carry-forward, requested on Form T1A for the carry-back and claimed on line 25200 going forward. The loss cannot be transferred to a corporation on incorporation, which is a reason to consider the timing of incorporating a business that is still in its loss years, discussed in incorporating versus staying a sole proprietor.
The bottom line
A loss is an asset with a 20-year life and a 3-year look-back. Record it on Schedule 4 every year, carry it back by default, hold it when a higher-rate year is coming or a change of control would restrict it, and remember that it reduces the income the 9% rate applies to. The claim is a decision, made on each return.
Which direction saves more depends on the rates in your earlier years and the income ahead; ask about your own situation and a CPA replies free, usually the same business day. The loss terms are defined in the glossary.
General information for Canadian business owners, current as of November 2026; not tax, legal or accounting advice, and no client relationship. Rules change, so speak with a CPA before acting.
Prepared and reviewed by a CPA at EverStone CPA, serving businesses in BC, Alberta, Ontario and Manitoba. About the firm → · Send an enquiry →
Schedule 4 and the carry-back request are part of every T2 return EverStone prepares, with the direction chosen before filing.
Frequently asked questions
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